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Well, it uses Google's rendering engine, which is FOSS.The UI layer is their own and is proprietary.
Back in the day, Opera's Presto engine was my 2nd try when a page rendered in a crazy way.
Similar to how the Eudora email app dumped its own core and went with Thunderbird's with their own UI pasted on.Corporations do weird things.
-- OriginalOwner_ [soylentnews.org]